403421403 has 32 divisors (see below), whose sum is σ = 699789312. Its totient is φ = 200455200.

The previous prime is 403421363. The next prime is 403421419. The reversal of 403421403 is 304124304.

It is not a de Polignac number, because 403421403 - 2¹³ = 403413211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 403421403.

It is not an unprimeable number, because it can be changed into a prime (403421483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32653 + ... + 43278.

It is an arithmetic number, because the mean of its divisors is an integer number (21868416).

Almost surely, 2^403421403 is an apocalyptic number.

403421403 is a deficient number, since it is larger than the sum of its proper divisors (296367909).

403421403 is a wasteful number, since it uses less digits than its factorization.

403421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75975.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 403421403 is about 20085.3529468616. The cubic root of 403421403 is about 738.9010978123.

Adding to 403421403 its reverse (304124304), we get a palindrome (707545707).

The spelling of 403421403 in words is "four hundred three million, four hundred twenty-one thousand, four hundred three".